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  2. Federal Aviation Regulations - Wikipedia

    en.wikipedia.org/wiki/Federal_Aviation_Regulations

    Title 14 CFR – Aeronautics and Space is one of the fifty titles that make up the United States Code of Federal Regulations (CFR). Title 14 is the principal set of rules and regulations (sometimes called administrative law) issued by the Department of Transportation and Federal Aviation Administration, federal agencies of the United States which oversee Aeronautics and Space.

  3. Graphene - Wikipedia

    en.wikipedia.org/wiki/Graphene

    It is an allotrope of carbon in the form of a plane of sp 2-bonded atoms with a molecular bond length of 0.142 nm (1.42 Å). In a graphene sheet, each atom is connected to its three nearest carbon neighbors by σ-bonds , and a delocalized π-bond , which contributes to a valence band that extends over the whole sheet.

  4. Presidency of Barack Obama - Wikipedia

    en.wikipedia.org/wiki/Presidency_of_Barack_Obama

    The deal also permanently indexed the alternative minimum tax for inflation, limited deductions for individuals making more than $250,000 ($300,000 for couples), permanently set the estate tax exemption at $5.12 million (indexed to inflation), and increased the top estate tax rate from 35% to 40%. [141]

  5. Iron - Wikipedia

    en.wikipedia.org/wiki/Iron

    Unlike many other metals, iron does not form amalgams with mercury. As a result, mercury is traded in standardized 76 pound flasks (34 kg) made of iron. [66] Iron is by far the most reactive element in its group; it is pyrophoric when finely divided and dissolves easily in dilute acids, giving Fe 2+.

  6. Fossil - Wikipedia

    en.wikipedia.org/wiki/Fossil

    Fossils have been visible and common throughout most of natural history, and so documented human interaction with them goes back as far as recorded history, or earlier. There are many examples of paleolithic stone knives in Europe, with fossil echinoderms set precisely at the hand grip, dating back to Homo heidelbergensis and Neanderthals . [ 15 ]

  7. San Francisco - Wikipedia

    en.wikipedia.org/wiki/San_Francisco

    San Francisco, [23] officially the City and County of San Francisco, is a commercial, financial, and cultural center within Northern California.With a population of 808,988 residents as of 2023, [14] San Francisco is the fourth-most populous city in the U.S. state of California and the 17th-most populous in the U.S.

  8. Brooklyn - Wikipedia

    en.wikipedia.org/wiki/Brooklyn

    According to the Federal Deposit Insurance Corporation, there were 37 banks and 26 credit unions operating in the borough in 2010. [ 124 ] [ 125 ] The rezoning of Downtown Brooklyn has generated over US$10 billion of private investment and $300 million in public improvements since 2004.

  9. Texas - Wikipedia

    en.wikipedia.org/wiki/Texas

    While far from the major battlefields of the American Civil War, Texas contributed large numbers of soldiers and equipment. [103] Union troops briefly occupied the state's primary port, Galveston. Texas's border with Mexico was known as the "backdoor of the Confederacy" because trade occurred at the border, bypassing the Union blockade. [ 104 ]